Valve-gear for explosive-engines.



.Rw 0 9 l AUI! l V. 0 N m T w N N E I TL G A N P E E uw Kw www VX. MME .R TUO F WR An E G E V, L A V, 5.. ...l 9, 3 4 Wl w N APPLICATION FILBD'SEPT. 22, 1902.

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Patented November 10, '1.903.` y y.

WLTER J. MCVICKER, OF ROGERS, NEBRASKA.

SPEGIFIGATION forming part of Letters Ilatent` No. 743,915, dated November 10, 1903.

Application led September 22, 1902. Serial No. 124,348. (No model.)

To all whom it may concern:

Be it known that I, WALTER J. McVicxER, a citizen of the United States, and a resident of Rogers, in the county of Colfax and State of Nebraska, have invented new and useful Improvements in Valve-Gear for Explosive- Engines, of which the following is a full, clear, and exact description.

This invention relates to improvementsl in gas or gasolene engines of the 'tour-stroke cycle-compression type, the object being to provide a simple means for operating the exhaust-valve by the explosion of gas or gasovchamber at 6.

lene vapor in an auxiliary cylinder containing a movable piston, thus dispensing with all gears, cams, eccentrics, dac., and further to provide a means by which the speed of the engine may he exclusively controlled by electricity.

l will describe a valve-gear for explosiveengines embodying my invention and then point out the novel-features iu the appended claims.

Reference is to be had to the accompanying drawing, forming a part of this specification, in which the ligure isa longitudinal section of a gas-engine embodying my invention.

Referring to the drawing, l designates the. main cylinder, in which the main piston 2 operates, said piston having connection witha crank 3 on the driving-shaft 4. The inletchamber is indicated at 5 and the exhaust- The inlet from the chamber 5 is controlled by a valve 7, held normally against its seat by means of a spring 8. The

inlet and exhaust chambers communicate with the main cylinder through the port 9. Attached to the main cylinder is an auxiliary cylinder 10, having ports 11 and 12, communicating with the main cylinder. Operating in the auxiliary cylinder is a piston 13, having an annular port 1l and ports 15 leading therefrom to the rear side of the piston. The exhaust-valve 16 has its stem 17 loosely engaged with the piston y13, and surrounding said stem 17 is a spring 18. The spring 18 bears at oneend against an abutment on the stein and at the other end against a Wall of the exhaust-chamber. A

From a sparking device 19 in the main cylinder wires 2O 21 lead to the secondary of an induction-coil 22, and from the primary of tion with the frameof the engine, and a wire 24 leads to connection with a contact-point 25, seated in a collar 26, of insulating material, arranged around the shaft 4:. This collar is provided With a handle 27, by means of which it may be adjusted to cause the sparking at the desired moment. A contact-finger 28 is carried by the fly-wheel 29 and is designed at intervals Vto engage with the conlpiston 2 reaches the line m, it has uncovered the passage or port 11, which leads to the auxiliary cylinder and through the piston 13. Ast-he piston 13 is detached from the valvestem 17, itis free to move inward against the resistance of a spring 30. The said spring 30, it may be here stated, has less resistance or is weaker than the spring 8 for the admission-valve, so that when the line of the pis- .ton 2 moves from m' to n the cylinder 10 will be exhausted through the passages or ports and 11 into the main cylinder and the line w of the piston 13 will bemoved toward the line .e against the resistance of the spring 30. The main piston 2 has completed its suctionstroke when its line @c reaches the line n, and the main cylinder 1 now contains an explosive mixture of gas or vapor. Further, the operation may he stated as follows: As the main piston 2 moves fromn to m on its compression-stroke, it expels a portion ot the explosive mixture in the cylinder 1 through the passages 15 and l1 into the auxiliary cylin- IOC moves the piston 13 outward against the resistance of the spring 18, and thus opens the exhaust-valve. The main piston does not uncover the passage 12 on its outer stroke, and when the auxiliary piston 13 moves out the passage 15 is disconnected from the passage 11, so that the pressure is sealed in the auxiliary cylinder,and thus the exhaust-valve is held open until this pressure is relieved. The main piston 2 now moves inward on its expelling stroke, and when its line 0 reaches the line n it has completed its expelling stroke and uncovered the passage or port 12, which relieves the pressure in the cylinder 10 and allowsl the spring 18 to close the exhaust-valve 16. Thus one cycle of four strokes is completed. The speed is controlled by interrupting the electric current used to ignite the charge, and thus preventing an explosion, as follows: It may be here stated that the contact or brush 28 is mounted on a block 31 of insulating material and carries a contactpoint 32 for engaging with a block 38 in electric connection with the fly-wheel. As the contact or brush 28 is moved around the collar 26, it will come in contact with the contact 25, closing the primary to produce the spark at 19.

In case of overspeed the centrifugal force will cause the block 33, which is mounted on a' spring-plate, to separate from the contactpoint 32, and thus interrupt the primary current, which will prevent an explosion vuntil the speed falls to the normal. The sparking device and governor, however, form no part of the present invention.

It will be noted that the passage 1l is only opened at the outer end of the stroke and the passage l2 is only opened at the inner end and that the piston 13 forms a valvular appliance for holding the pressure in the auxiliary cylinder.y y

Having thus described my invention, I claim as new and desire to secure by Letters Patentl. In an explosive-engine, a main cylinder having inlet and outlet ports, a main piston operating therein, an auxiliary cylinder having port communication with the main cylinder, a piston operating in the auxiliary cylinder, the said piston hajving an annular port, and ports leading therefrom to the rear of the piston, and a valve for the exhaust having loose connection with the piston in the auxiliary cylinder and operated by the explosion of gas or vapor mixture in said'auxiliary cylinder, while one of the ports is closed by the piston in the main cylinder.

2. In a gas-engine, a main cylinder, a main piston operating therein, an inlet-chamber and exhaust-chamber, the said chambers being in port communication with the main cylinder, valves for said chambers, an auxiliary cylinder having two ports communicating with the main cylinder, one rearward of the other, a piston operating in said auxiliary cylinder and having ports in connection with the ports leading to the main cylinder while the main piston is in forward position, and the said main piston operating to cut off the communication when in rearward position, and a stem extended from the exhaust-valve and having loose connection with the piston in the auxiliary cylinder.

3. Ina gas-engine, a main cylinder, a main piston'operating therein, an inlet-chamber and exhaust-chamber, the said chambers communicating with the main cylinder, an inletcontrolling valve, a spring for holding said valve to its seat, an exhaust-valve, an auxiliary cylinder having two ports com municating with the main cylinder and.adapted to be cut off by the main piston, a piston operating in the auxiliary cylinder and having ports normally communicating with the firstnamed ports, a spring engaging with said piston and having a less resistance than the spring of the inlet-controlling valve, a stem extended from the exhaust-valve and having loose connection with the piston of the auxiliary cylinder, and a spring for holding said exhaust-valve to its seat.

In testimony whereof I have signed my name to this specification in the presence of two subscribing witnesses.

WALTER J. MOVICKER. 

